bug#25598: R packages are not bit-reproducible

[Ludovic Courtès]

R packages build non-deterministically:

  https://www.gnu.org/software/guix/packages/reproducibility.html

--8<---------------cut here---------------start------------->8---
$ wget -q -O - 
https://mirror.hydra.gnu.org/nar/imiwif0wn7dxcc7f4zdq09y1l1132pqj-r-zoo-1.7-14 
| bunzip2 | guix archive -x one
$ wget -q -O - 
https://bayfront.guixsd.org/nar/gzip/imiwif0wn7dxcc7f4zdq09y1l1132pqj-r-zoo-1.7-14
 | gunzip | guix archive -x two
$ diff -ru one two
diff -ru one/site-library/zoo/DESCRIPTION two/site-library/zoo/DESCRIPTION
--- one/site-library/zoo/DESCRIPTION    2017-02-01 10:49:49.700423133 +0100
+++ two/site-library/zoo/DESCRIPTION    2017-02-01 10:49:57.224462007 +0100
@@ -28,4 +28,4 @@
 Maintainer: Achim Zeileis <address@hidden>
 Repository: CRAN
 Date/Publication: 2016-12-19 09:38:14
-Built: R 3.3.2; x86_64-unknown-linux-gnu; 2017-01-15 03:12:57 UTC; unix
+Built: R 3.3.2; x86_64-unknown-linux-gnu; 2017-01-23 21:48:44 UTC; unix
Binary files one/site-library/zoo/Meta/package.rds and 
two/site-library/zoo/Meta/package.rds differ
--8<---------------cut here---------------end--------------->8---

First there’s a timestamp in ‘DESCRIPTION’ (this is discussed at
<https://bugs.debian.org/782764>).

The .rds differences seem less trivial but there’s apparently a fix at
<https://bugs.debian.org/774031>.

Ludo’.